🔐 JWT Decoder & Encoder: Complete Guide
Our JWT Decoder/Encoder helps you safely inspect, validate, and craft JSON Web Tokens. Decode an incoming token to review its header, payload, and signature components, or encode a fresh payload to generate a new token for testing and QA.
✨ What the tool does
- ✓Decode JWTs to view header, payload, and signature segments in plain JSON.
- ✓Validate token structure and quickly spot expired or malformed claims.
- ✓Encode custom payloads to test auth flows, role flags, or sandbox APIs.
- ✓Copy decoded sections for documentation, debugging, or support tickets.
🚀 How to use it
- Paste a JWT token into the decoder and click Decode to view header and payload JSON.
- Inspect claims (iss, sub, aud, exp, roles) and timestamps to verify authenticity and lifetime.
- Switch to encode mode, enter a payload, and generate a signed token for testing.
- Copy header/payload/signature or the full token to share with teammates or drop into Postman.
Note: This tool is for local inspection and testing. Always keep production secrets (keys, private claims) safe.
🔧 Encoder vs Decoder
Decoder
Takes an existing JWT, splits it into header, payload, and signature, and renders JSON for human-readable review.
Encoder
Accepts a JSON payload and produces a JWT string for testing claims, roles, or expiry behavior in your apps.
📌 Best practices
- Use decoded claims to confirm audience, issuer, and expiry before trusting a token.
- Never paste private keys; this tool is for inspection, not signing with production secrets.
- For QA, encode tokens with short expiries and mock roles to test access control.
Try the JWT Decoder/Encoder
Paste a token, inspect the claims, or generate a test token in seconds.
Open JWT Decoder →